Put your muscle memory to work

Can't remember where you left your car keys? Hop on the treadmill and you may never misplace them again. A four-times-a-week cardio routine may tone your memory, researchers at Columbia University and Salk Institute say. The more physically fit volunteers became during a three-month study, the more blood volume was found in the hippocampus, an area of the brain linked to memorization of new information.